arch/x86/um/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 mainmenu "User Mode Linux/$SUBARCH $KERNELVERSION Kernel Configuration"
   3
   4 source "arch/um/Kconfig.common"
   5
   6 menu "UML-specific options"
   7
   8 menu "Host processor type and features"
   9
  10 source "arch/x86/Kconfig.cpu"
  11
  12 endmenu
  13
  14 config UML_X86
  15         def_bool y
  16         select GENERIC_FIND_FIRST_BIT
  17
  18 config 64BIT
  19         bool "64-bit kernel" if SUBARCH = "x86"
  20         default SUBARCH != "i386"
  21
  22 config X86_32
  23         def_bool !64BIT
  24         select HAVE_AOUT
  25         select ARCH_WANT_IPC_PARSE_VERSION
  26         select MODULES_USE_ELF_REL
  27         select CLONE_BACKWARDS
  28         select OLD_SIGSUSPEND3
  29         select OLD_SIGACTION
  30
  31 config X86_64
  32         def_bool 64BIT
  33         select MODULES_USE_ELF_RELA
  34
  35 config ARCH_DEFCONFIG
  36         string
  37         default "arch/um/configs/i386_defconfig" if X86_32
  38         default "arch/um/configs/x86_64_defconfig" if X86_64
  39
  40 config RWSEM_XCHGADD_ALGORITHM
  41         def_bool 64BIT
  42
  43 config RWSEM_GENERIC_SPINLOCK
  44         def_bool !RWSEM_XCHGADD_ALGORITHM
  45
  46 config 3_LEVEL_PGTABLES
  47         bool "Three-level pagetables" if !64BIT
  48         default 64BIT
  49         help
  50         Three-level pagetables will let UML have more than 4G of physical
  51         memory.  All the memory that can't be mapped directly will be treated
  52         as high memory.
  53
  54         However, this it experimental on 32-bit architectures, so if unsure say
  55         N (on x86-64 it's automatically enabled, instead, as it's safe there).
  56
  57 config ARCH_HAS_SC_SIGNALS
  58         def_bool !64BIT
  59
  60 config ARCH_REUSE_HOST_VSYSCALL_AREA
  61         def_bool !64BIT
  62
  63 config GENERIC_HWEIGHT
  64         def_bool y
  65
  66 source "arch/um/Kconfig.um"
  67
  68 endmenu
  69
  70 source "arch/um/Kconfig.rest"